Script submission guidelines?

Here’s a quick link to an interesting post at Mr. Excitement News on script submission guidelines for smaller theatre companies. Check it out here.

Further questions:
Do most small theatre companies have firm script submission guidelines? What works? What doesn’t? Any tips?

UPDATE:

More further questions:
What works for playwrights? How do you prefer to send your scripts (email or hard copy via snail mail)? Do playwrights prefer sending PDFs or Word documents? What is the minimum response you expect from the theatre company? Other than having the company produce a full production of your script, are there any secondary benefits a playwright can hope for when submitting a script (workshop, reading, feedback, etc.)?